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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2072e922a3ac80a8e1a395d429feaca8625aa473f7ddc503b5afe28f8525f65' 
  AND token = 'hH2GkIX8NNd4rB/pn4QpxX3MKqD8keOo6L6LEw7pY9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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