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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c0630e5861452369e13da342435e022786a26b2dada3ae52e775305519c5b2' 
  AND token = 'WP89f5mi2r25JJjbZuOXe+kR/vnU0r1LJLV0s/NupC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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