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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fba99cf954dc6cad0c1123c466162cbe2e2cb17074a4338b011db5f1e69bfcf' 
  AND token = '8AJzfiScUMCzOra4CI8zqNA4Sch1M98hJhFYPUKGDzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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