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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955461288631706f37e104bef0ee29c98a31204384c389dfb90bbdae5ebf4236' 
  AND token = '8KQ5+ZAgqo6tScMHqIRk5L63Ym5AbQ2DgYACehXgy/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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