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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba52eeb061495f5b3c4634f6e0409498ba41c71eec068cf28a6adb14f5d63a9' 
  AND token = 'd7LEZPDTiXvoQEaeL1p6/ftkyvGDfqhqPdvO9VxMRL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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