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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbb1014904047a470d2776b9bb3fb437d12b08526817022a0c1183a831f480e' 
  AND token = 'H3v5jqPFdOTjAptnWIAfgNTPtswdIEyV6naxJJGjsnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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