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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275a02bf956c7115f8128b962035db981c82b173ce7691f684c5c28bea8d2a45' 
  AND token = 'ODafAIf0VOgXHdPzsTCwzXWddSgheq01F1y0adj7N84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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