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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a25a7bff1a7f3573ca5ebae008f760ca5adb96ddf8407c63af3d5abd567e84' 
  AND token = 'o48jq4mdg7co7M3zqDqks/zty7vwwHOWKIkrBK/33Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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