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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0746f2c5dec7d6c41b4ab8602eadaabfb845d05d379e86750260fc2c2033fed0' 
  AND token = 'kj1CxisJawGpbymjRuRhAmSWnqDRjwUWcd/S5Dha3/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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