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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad3aaed12817b4d94d7b09df46c138b188ce03381e1f1697c4f3cf98a40fcde' 
  AND token = '5XEDPi1V4qvw1EWgbjcTOS9FqfBz1BtqLzeTsWCIUig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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