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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7107d8235ada7b9ca9dc5351615b4cad757f1e1d3a06223388e0faa5853a19' 
  AND token = 'OBZDpwHawj8+Jgg7y0D51QVKgjdSP8O4pX09O494P3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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