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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f7461e82893bedfb790d6bdd107bec7d7d0e09d8f3b123de41572041b1067f' 
  AND token = 'evs5W5lIeoeWdOUXsUg/5XlmExpjbCUuOFrWDN6fOzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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