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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96afbd7f00ba557d6d181b4e3efd3c6f02a2458c6171d699247c92af6d0d3ef0' 
  AND token = '8UQvCi/D+eX7ls6QMw0Ukgm0/5qMHcotNIUBTu+5V5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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