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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeeb731f297df17d49e94b06d2cfd2451474e0de5d677575f64712588f394a0d' 
  AND token = '/kJ0HthBjHMY35JoLPNgboLD4NTe1P5vHCBdDdLzfzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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