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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e984a6fceabf4966359eb83d89bb2f1b30477d39709db5e7a3bef645ab1ffd2' 
  AND token = '2FMNg3VNQdY6D9TST6aRxu0xMlvzK0wG0eimIvKOxyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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