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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c9608fd298954bc87fc5377f7001f10c2c26fb180d152e6afbe7dbb4f1a6e8' 
  AND token = '4xeLJHCVlIgCZJY7XrGkHEWbbhILWFLWcOdOvk44M1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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