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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0ae7a755ad4c5dc9660f83f69f0142e047d04e8f1e9ae8e75ada6f6eb48165' 
  AND token = 'KqPzEKT/EPcaRPN883JsbustuuuI9Y7SPCoUafjMv6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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