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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07c5b6b7a69db5b9f2404115ac09bb6beaacd7388c848fe14e20e175da80f94' 
  AND token = 'gS8sktCRc2hJxhpQ3q6SsOX5kgGCdwqZHrBuDFyxq4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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