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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62f565e0c0b7e2aaff2923d07b13d7ee2633bbb2e713d92f676f210ce228a6e' 
  AND token = 'SRq66ZNLUnl7JI5pQUVum4phSWQHEuiLeFonWIYrA7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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