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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8573a7edbc4395013546a51f9cdf4ffeddf87fc27c3a9d3fe1759be2abb0e83f' 
  AND token = 'exTm2SG1cB16+JVdXYVP+dbwXX9LDc9gikLafz3rs1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}