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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a6eb3892b02c2e3307f1d874d1cf55346a7773c378afcf3969ed104f7189ed' 
  AND token = 'GUW0WALDp3hx07XiS52Zv+VYQjfyAejVJwhUb9fLdIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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