SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6ba268e285e4226c53cf1afc9d852a2b3e8d41d8dc230c5b60a295669f6a87' 
  AND token = '/vJr8NIFpdXodjtdBZzh9sOEwYX/1y5GP0NGA+6us+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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