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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3f4fc035aaf75e1fbdc0d20e13b664bb74fd4b0060f8124ca842652e56a232' 
  AND token = '6jTQ2O2ISNrdBlK9I1Rdcs3WjfKZCtc40/tOgxMxFv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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