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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc72385df3c9ee04240b94c9dc55d255a0426e39f3309b49b11251d04ff3a4b' 
  AND token = 'M8A8Ean25n5HbLOetOx4pCfXVMOLgnpRj/AmooAqhSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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