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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5698f1affc5451431c9ce6829dacaec8d569f183c5a30ac39d83378a4bc87f20' 
  AND token = 'YlK2Z3NsdoG6ZHG+QCkCeDV38XXv2MEGg9oykAld4A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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