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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9253c82c27164fa915b8c2dcbf36a1b3115a71b3fec099dee03351319cf87b5' 
  AND token = '6c6krlh9xzVfRlPiuZ77Fw47AmzzpVxykKeu5nQfvfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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