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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94becb9a2e3877322cbc03884bac686dcb22771ca96d24faf8b2ac2d4e19f3d6' 
  AND token = 'dMsZhCNSGWRwRWiWaknOVMciwL5B9Fn50f17y+iDeH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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