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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa4c6c46f903788479b775fb172187e610c88def2c322e04b332edd7faa74d8' 
  AND token = 'BNc6VsgqoIhID+F045e1lOmmlJ0O38tg98vKPlMJj+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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