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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e9dd6d292d9878b6ace1864a8b679c4241e4adeab3907d7c282d20a6695499' 
  AND token = '66qPQQgL1+wi21ele2SN9M2IIXeOoogaJbP+t/n6lak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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