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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b5e8fd408b3142ff8312541b11380907063798e8c4d0e731957f68db4d3201' 
  AND token = 'S9sv8FVehTjERlUqKTwRoRRvlvp9wz5ES98J73QQoQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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