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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecab1fe9518c8218e86d51ea91c4830cab65d0b70a3b3b78de87b72ad5ce3b4' 
  AND token = 'KjeHYo3A5jBIiN3QhkLvnLc4v0VC/cDL8c37CinGB3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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