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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a06bbc5c1d8a349c2ea664e19f88a45828b22bf285fd4e22c31361e70f6950' 
  AND token = '/zVLEeO3lCa63Rn9NIbCi8XEhLKo268CD6eWwm1OONk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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