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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc4140643b07903042ebfa466c89e983f4f9e91c504b61d51f5a6e40e71df29' 
  AND token = 'OsKqFsodzJdvZAsp43TVf7x1jFlKQFOv4t9iziKssWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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