SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f96209853dadd6af07644a361b34946f6cc317a9dfaf489ba4c1aad4167e213' 
  AND token = 'LdDHnjlKYVqh7tCzu+z49jIXrpwCVxUsso9HX3FrRRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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