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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9c71f30d00907b66d1dc6968799325f3a1ff3714e7f5980e4a1a0ef5fa8379' 
  AND token = 'NlFqMma79t6Cu0CEFbWn+PYOQ5jruHrTgFC6NARTLGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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