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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0539ea614bac1cede06403a6d63f59cffe081163c009dd5b7fb1f3177b5d4e' 
  AND token = 'oOL5ZGWqL6Ycm3hLEwo/EsdOnt8bfhfKgoxlw14TCGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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