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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6225f4c96b1f9e496457047227a12832c2a4bda4422fce957ecad0efb690e0' 
  AND token = 'yYDcO8v9HU82BkW4QE0l4YfvYGfgFHCQe2oaX1EJn7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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