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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3360e85f92bfd9031497665ff82abb6513b79721adfac87139ab10c316c3886b' 
  AND token = 'ZWR8VSLC40w6wO9GghyVKXH3cA5tM7i4kMZ+cA1YQks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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