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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9473534b533c5f7d9dd58b960e2f1dc2d5d3e8f7b6063a477ff5fcfb19a03eb7' 
  AND token = 'ngsxqCQ7/wAcoULw2insEi4yussalGyUSNqzTk4C5L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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