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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acdb470afd89de2528a798da5c1917016608dc401739952c1e1d7e80ba1892d' 
  AND token = '4Syr9R9WeVPRW0hBgtQSrf3ykAFA9fCTpOhlIHZxlY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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