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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33b256116ff4c46d355f6c83c74113e5d7aa92113ac1113c73c311cc22610cc' 
  AND token = 'w6IvHJqhlJlUcFQgGk8ojXBfy4NVuv0kmRbb5L7aJpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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