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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60add43607f57efb363f9fe7ed2d910b77abffa08a7bc1b9e95d96897d0c9cd' 
  AND token = 'wLeDp1cRJsq2z+qpfK2NZKwpdspmsIkqwDiXTxk86OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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