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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3fb82cc6e98ef38269de62c46b79cea705efb357d891fa56cc28954481cce4' 
  AND token = 'v6C1E3oNXXLsyEAgGZjkxc1tSRE4MTP1WkswVYW5FaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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