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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdfff2690be255cc8b5c44ba22942bfcd6005b00949f869e2727de05581eb71' 
  AND token = 'V4uuY88HaocFuxLT2/JsZzAO02STfVRQg1ko21sKS1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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