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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9873b284cab11b6491e56ebdb7340c312f7581751f566a7e293b3f9de4ddc87d' 
  AND token = 'uVnJ2gq2wECNWkR7Z3J0RNxojUPvuZxes9UOcmBASak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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