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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb65d9d786f922be5b76f654239a2ed62edcb0fed093d86092fa42add5a0cd62' 
  AND token = 'MvYRoqDmq/kYWzvznfQfnHjw5xf5GIgU5O1S5XdqQD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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