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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576cc8d1b65e41c5adcc07364c8e6ca38d5f27177643a73bd1265c1ab46be4a9' 
  AND token = 'hBu9fTRGguzNVvKSAco68yt2gT68Xdqh8SnEWVLqMyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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