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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdafb7187317b2aa7555d05817182d1b713e47875ee285692d99f7da7c3f44f' 
  AND token = '4zl1jfJ0CmswUoVmheTFSutmGyqE4y9z9/q3Qe/68/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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