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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087aa2d4b32b2207556d39786cc4f54ce37a157cb2a98ce4b77cca1846ea024a' 
  AND token = 'tWbSafzAguVgTFJ8bb+U/V68ABUIrVGNH5d8UfCibbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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