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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894ca4e9e19c8c4410a91f0e89b5bc2bc705e4e05e18ae3b82602b6a41564ff5' 
  AND token = 'Redf9nAn0GAjKYWT96uCMB5zfj3IQEUuCXAVpd96Ot8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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