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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d95ff6f3970086748c368cfae62f5e65c170e7c9c249693fdc64680d340932' 
  AND token = 'LR3hFnNDBEAG9lN+IhiqvTuGARwhXMU4RChOU7d9DGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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