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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1cf7e4135f14a19d1b52116721fafeb4034393c25590b2a2505c6bd056ccb66' 
  AND token = 'y/ESV4jAPv8FVYgGNPUk7F0iErxUjqEbAsqhoCG9L5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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