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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf1e075d94b4d7a51ea732c27650a7f39212bce3c37f23540e8fe18b12ddd2d' 
  AND token = 'f6viOEEr3YjcXGN/2G7DfmqatlA8Ct887w3XpaoUV9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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