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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d00397eca6cf32210706307ff4d9a39a24d92d502fe5c7233b9c6810426b70' 
  AND token = 'WsdmZbDVur/LioLt1NMMZwQ6OA4kuvOry5hJ3brKfCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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